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# The average weight of 36 students in a class is 62 kgs. If the weight

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Re: The average weight of 36 students in a class is 62 kgs. If the weight [#permalink]
Bunuel wrote:
The average weight of 36students in a class is 62 kgs. If the weight of the teacher is also included the average becomes 62.5 kgs. Find the weight of the teacher.

A. 80
B. 80.25
C. 80.5
D. 80.75
E. 81

36*62+x = 62.5* 37
x = 80.5
IMO C
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Re: The average weight of 36 students in a class is 62 kgs. If the weight [#permalink]
Bunuel wrote:
The average weight of 36 students in a class is 62 kgs. If the weight of the teacher is also included the average becomes 62.5 kgs. Find the weight of the teacher.

A. 80
B. 80.25
C. 80.5
D. 80.75
E. 81

We can let n = the weight of the teacher and create the equation:

(36 x 62 + n)/37 = 62.5

2232 + n = 2,312.5

n = 80.5

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Re: The average weight of 36 students in a class is 62 kgs. If the weight [#permalink]
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Bunuel wrote:
The average weight of 36 students in a class is 62 kgs. If the weight of the teacher is also included the average becomes 62.5 kgs. Find the weight of the teacher.

A. 80
B. 80.25
C. 80.5
D. 80.75
E. 81

average increases form 62 to 62.5, so 0.5

total increase = 37 * .5 = 18.5

weight of the teacher= 62 + 18.5 = 80.5 = C the answer

thanks
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Re: The average weight of 36 students in a class is 62 kgs. If the weight [#permalink]
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Re: The average weight of 36 students in a class is 62 kgs. If the weight [#permalink]
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